Incidentally, Lisp doesn't even represent boolean values as 0 and 1, it represent them as nil (equivalent to '(), the empty list) and anything-but-nil. Indeed:

Incidentally, Lisp doesn't even represent boolean values as 0 and 1, it represent them as nil (equivalent to '(), the empty list) and anything-but-nil. Indeed: * (if 0 "truthy" "falsey") "truthy"